Importance and Purpose of a title sequence

This is the title sequence of Catch me if you can and has been designed and created by Saul Bass. This particular title sequences is extremely keen on using lines and animation to represent on-screen names and in frame story of the different professions and journey's that may occur during the film.

This title sequence firstly presents the production company that have funded and created this film and in this particular case "Dream Works pictures".
In a title sequences this is the order in which the on-screen names appear;

• Production company
• Director 
• Highest grossing Star and then other actors/actresses
• The name of the Film and in this case its "Catch me if you can"
• Producers and Co-producers
• Music then Costume designers 
• Ending with the directors name before the film begins.

The second title sequence that I watch was Se7en which was designed by the renowned Kyle Cooper. This particular title sequence is extremely dark and etchy as the on-screen production and cast names appear blurred and quivering. The title sequence also has rapid cuts to weird images and this doesn't give particularly much of the story away as the images only imply that the film will have elements of a thriller or crime, this is due to it seems similar to a detective enquiry case and evidence is being revisited.

This title sequence also presents the on-screen names in the same chronological order as Catch me if you can as this sequence appears in this particular order as the production company is the most important and in the middle more inadequate names appear.